Before leaving this subject we note that it should be possible to start from a microscale thermal model of the constituent parts of the cell, for example that given by Latz and Zausch [1]}, and to homogenise this to obtain a macroscale thermal equation analogous to (REF ). However, such an analysis has not, as far as we are aware, been performed. We also note that the macroscale thermal equation can be coupled to single particle models but, while it is straightforward to compute the heating terms occurring on the right-hand side of (REF ) for the simple SPM model, so far no-one has derived expressions for \(\dot{Q}_\mathrm {irr}\)  and \( \dot{Q}_\mathrm {rev}\)  in the case of the SPMe-type models. This is because of the difficulty in accounting for electrolyte heating in these formalisms.
